16443661361 has 2 divisors, whose sum is σ = 16443661362. Its totient is φ = 16443661360.

The previous prime is 16443661343. The next prime is 16443661373. The reversal of 16443661361 is 16316634461.

16443661361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13840110736 + 2603550625 = 117644^2 + 51025^2 .

It is a cyclic number.

It is not a de Polignac number, because 16443661361 - 2¹⁴ = 16443644977 is a prime.

It is a super-3 number, since 3×16443661361³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16443663361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221830680 + 8221830681.

It is an arithmetic number, because the mean of its divisors is an integer number (8221830681).

Almost surely, 2^16443661361 is an apocalyptic number.

It is an amenable number.

16443661361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16443661361 is an equidigital number, since it uses as much as digits as its factorization.

16443661361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The spelling of 16443661361 in words is "sixteen billion, four hundred forty-three million, six hundred sixty-one thousand, three hundred sixty-one".